What are some sticky things that begin with the letter o?

One example of a sticky substance that begins with the letter "o" is "oobleck," a non-Newtonian fluid made of cornstarch and water that can behave like a solid or a liquid depending on the force applied to it. Another example is "oak resin," a sticky substance that oozes out of oak trees when they are wounded, serving as a protective barrier against pathogens and insects. Additionally, "oatmeal" can become sticky when cooked, due to the release of starches that thicken the mixture.